ASTM A335 Pipe Specifications, Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
ASTM A335 P11 alloy pipe ASTM A335 P11 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. |
ASTM A335 P22 alloy pipe ASTM A335 P22 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. |
ASTM A335 P9 alloy pipe The range of ASTM A335 P9 seamless alloy steel pipe sizes that may be examined by each method shall be subjected to the limitations... |
This specification covers seamless ferritic alloy-steel pipe for high-temperature service. The pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. The steel material shall conform to chemical composition, tensile property, and hardness requirements. Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices. The range of pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practices. The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.
Mainly Grade of ASTM A335：
ASTM A335 P11, P22, P5, P9, P91, P92
Chemical Composition (%) for the main grade
Grade |
C |
Mn |
P, S, max |
Si |
Cr |
Mo |
P11 |
0.05-0.15 |
0.30-0.60 |
0.025 |
0.50-1.00 |
1.00-1.50 |
0.44-0.65 |
P22 |
0.05-0.15 |
0.30-0.60 |
0.025 |
0.50 max |
1.90-2.60 |
0.87-1.13 |
P5 |
0.15 max |
0.30-0.60 |
0.025 |
0.50 max |
4.00-6.00 |
0.45-0.65 |
P9 |
0.15 max |
0.30-0.60 |
0.025 |
0.25-1.00 |
8.00-10.00 |
0.90-1.10 |
P91 |
0.08-0.12 |
0.30-0.60 |
0.020/0.010 |
0.20-0.50 |
8.00-9.50 |
0.85-1.05 |
V 0.18-0.25 |
N 0.03-0.07 |
Ni 0.40 max |
Al 0.02 max |
Nb 0.06-0.10 |
Ti 0.01 max |
|
| P92 | 0.07-0.13 |
0.30-0.60 |
0.020/0.010 |
0.50 max |
8.50-9.50 |
0.30-0.60 |
V 0.15-0.25 |
N 0.03-0.07 |
Ni 0.40 max |
Al 0.02 max |
Nb 0.04-0.09 |
W 1.50-2.00 |
|
B 0.001-0.006 |
Ti 0.01 max |
Zr 0.01 max |
Mechanical Properties
| Data | Grade P11, P22, P5, P9 |
Grade P91 |
Grade P92 |
| Tensile strength, min, (MPa) | 415 |
585 |
620 |
| Yield strength, min, (MPa) | 205 |
415 |
440 |
| Elongation, min, (%), L/T | 30/20 |
20/… |
20/… |
| Heat Treatment | A / N+T |
N+T / Q+T |
N+T |
Material & Manufacture
Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.
Heat Treatment Requirements
| Grade | Heat Treatment Type P5, P9, P11, and P22 |
Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering Temperature Range F [C] |
| P5 (b,c) | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| Subcritical Anneal (P5c only) | ***** | 1325 – 1375 [715 - 745] | |
| P9 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| P11 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1200 [650] | |
| P22 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| P91 | Normalize and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
| Quench and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
ASTM A335 P91 alloy pipe ASTM A335 P91 is the part of ASTM A335, the pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. |
ASTM A335 P92 alloy pipes ASTM A335 P92 pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. |
ASTM A213 T9 alloy pipes ASTM A213 T9 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes. |
Mechanical Tests Specified
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test
For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested.
For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe.
Notes for Hardness Test:
P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
Notes for Bend Test:
For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
Hydrostatic Test
The inside diameter of the bend shall be 1 inch [25 mm].
Each length of pipe shall be Hydro tested, at option of manufacture nondestructive electric testing can be used.
Ordering Information
Orders for material under this specification should include the following, as required, to describe the desired material adequately:
| Quantity | Feet, meters, or number of lengths |
| Name of material | Seamless Alloy Steel Pipe |
| Grade | P5, P9, P11, P22, P91 |
| Manufacture | Hot-finished or cold-drawn |
| Size using one of the following: | |
| NPS and Schedule Number | |
| Outside Diameter and Nominal Wall Thickness | |
| Outside Diameter and Minimum Wall Thickness | |
| Inside Diameter and Nominal Wall Thickness | |
| Inside Diameter and Minimum Wall Thickness | |
| Length | Specific or Random |
| End Finish | |
Referenced Documents
- A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
- E213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
- E309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
- E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
- E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
- E570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
- B36.10M Welded and Seamless Wrought Steel Pipe
- SAE J 1086 Practice for Numbering Metals and Alloys (UNS)
- SNT-TC-1A Recommended Practice for Nondestructive Personnel Qualification and Certification